Control device for elevator

Abstract

There is provided a control device for an elevator capable of quickly calculating an exact inertia according to an operation mode of elevator considering whether the operation mode of elevator is a power running operation or a generative running operation, and having good followability. In a control device for an elevator including a speed command inputting unit for sending a speed command to a power unit; a speed detector for detecting the actual speed of the power unit; and a torque controller for calculating a necessary torque based on the speed command and the actual speed, and sending a torque signal to drive the power unit, there are further included an initial parameter setting unit for setting the initial value of parameter of the torque controller in advance; an operation mode judging unit for judging whether the operation mode of power unit is a power running mode or a generative running mode; an inertia calculating unit for calculating the actual inertia value based on the speed command, the actual speed, and the torque signal, and the operation mode; and a parameter correcting unit for correcting the parameter of the torque controller by using the actual inertia value.

1 . A control device for an elevator comprising:
 a speed command inputting unit for sending a speed command to a power unit provided in an elevator to be controlled;   a speed detector for detecting the actual speed of an elevator car or the power unit; and   a torque controller for calculating a necessary torque so that the elevator is operated at the speed command based on the speed command and the actual speed, and sending a torque signal to the power unit to drive the power unit, characterized in that   the control device further comprises:
 an initial parameter setting unit for setting the initial value of parameter used for calculation by the torque controller based on the pre-assumed inertia value of the elevator; 
 an operation mode judging unit for judging whether the operation mode of power unit is a power running mode or a generative running mode; 
 an inertia calculating unit for calculating the actual inertia value of the elevator based on the speed command, the actual speed, the torque signal, and the result of judgment as to whether the operation mode is the power running mode or the generative running mode made by the operation mode judging unit when the power unit is operated according to the speed command; and 
 a parameter correcting unit for correcting the parameter used for calculation by the torque controller by using the actual inertia value calculated by the inertia calculating unit. 
   
     
     
         2 . The control device for an elevator according to  claim 1 , wherein the inertia calculating unit calculates the actual inertia value of the elevator so that the actual inertia value is in proportion to conversion efficiency predefined for each of the power running mode and the generative running mode of operation mode. 
     
     
         3 . The control device for an elevator according to  claim 1 , wherein the operation mode judging unit judges whether the operation mode is the power running mode or the generative running mode based on the speed command or the actual speed and the torque signal. 
     
     
         4 . The control device for an elevator according to  claim 3 , wherein operation mode judging unit judges that the operation mode is the power running mode if positive/negative signs of the speed command or the actual speed and the torque signal are the same, and judges that the operation mode is the generative running mode if the positive/negative signs thereof are different. 
     
     
         5 . The control device for an elevator according to  claim 2 , wherein the operation mode judging unit judges whether the operation mode is the power running mode or the generative running mode based on the speed command or the actual speed and the torque signal. 
     
     
         6 . The control device for an elevator according to  claim 5 , wherein operation mode judging unit judges that the operation mode is the power running mode if positive/negative signs of the speed command or the actual speed and the torque signal are the same, and judges that the operation mode is the generative running mode if the positive/negative signs thereof are different.